@article{DAN_1984_278_5_a15,
     author = {B. P. Belinskii},
     title = {The {Fredholm} property for boundary-contact problems of acoustics},
     journal = {Doklady Akademii Nauk},
     pages = {1090--1094},
     publisher = {mathdoc},
     volume = {278},
     number = {5},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_278_5_a15/}
}